Retaining wall block



FIG. 1 is a left side perspective view of a retaining wall block showing my new design;

FIG. 2 is a front elevation view;

FIG. 3 is a bottom plan view;

FIG. 4 is a right side elevation view, a left side view being the mirror image thereof;

FIG. 5 is a rear elevation view; and,

FIG. 6 is a top plan view. 

The ornamental design for a retaining wall block, as shown and described. 